The Gallup survey results also highlight partisan differences.

Several states have passed laws requiring public sector unions to "recertify" their membership ahead of collective bargaining, which proponents say is "about democracy." Critics counter it is an onerous burden for unions.

The 5-4 decision found that charging non-union employees "agency fees" is a First Amendment violation.

“Technology will displace workers from some, and potentially many jobs...but we have no reason to think technology will eliminate work in the economy as a whole,” said John Schmitt, vice president of the Economic Policy Institute.

Nationwide, an average of 77.2 percent of prime-working-age adults were employed in 2015, up from lows of about 75 percent after the 2007-09 recession.

The Uniformed Firefighters Association says the department is prominently displaying “discredited” statistics on its website, while others that show longer average response times are more difficult to find.